Okay, to settle it once and for all...
岩, the first part of his name (Iwa) means rock
隈, the second part of his last name (kuma) means corner or nook
So when put together, it can be read as cornerstone.
If you want to say rock bear fine, but that is the proper way to read it.
(Btw, the proper kanji for bear is 熊)
